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This paper presents a method that combines high-level and low-level architecture parameter exploration. The paper builds on an increasing body of work concerned with modeling reconfigurable architectures, and presents a full area and delay model of an FPGA. The optimization of this model is based on the use of geometric programming, and allows high-level architecture parameter selection and transistor sizing to be done concurrently. We use the framework to demonstrate that concurrent optimization of both high and low-level parameters can lead to significantly different architectural conclusions.